/**
 * #      1639
 * 名称   通过给定词典构造目标字符串的方案数
 * 链接   https://leetcode-cn.com/problems/number-of-ways-to-form-a-target-string-given-a-dictionary
 * 题解   [25](https://leetcode-cn.com/problems/number-of-ways-to-form-a-target-string-given-a-dictionary/solution)
 * 通过率 39.8%
 * 难道   困难
 */

